11.2 Downgrade Paths

Downgrade is only supported between General Availability (GA)
releases.

Downgrade from MySQL 5.6 to 5.5 is
supported using the logical downgrade
method.

Downgrade that skips versions is not supported. For example,
downgrading directly from MySQL 5.6 to 5.1 is not
supported.

Downgrade within a release series is supported. For example,
downgrading from MySQL
5.6.z to
5.6.y is supported.
Skipping a release is also supported. For example, downgrading
from MySQL 5.6.z to
5.6.x is supported.